Improvement in flour-bolts



ALLEN &; S TODDARDL Flour Bolt,

Y Patent ed May-H869.

I I I I N. PETERS. PhokoL'nhomphur, Wanhingtnn, D. C.

, WILLIAM H. ALLEN AND WILLIAM STODDARD, or WINO NESOTA.

' Letters Patent No. 89,907, dated Maydl, 1869.

IMPROVEMENT m FLOUR-BOLTS.

The Schedule referred to in these Letters Patent and making part of the same.

Skilled in the art to make and use the-same, reference being bad to the accompanying drawings, forming part of thisspecification, in which Figure 1 is a side View of a flour-bolt provided with our invention- Figure 2 is an end view of the bolt, showiuga side view of our invention. Similar letters of reference indicate corresponding parts.

struction and arrangement of the-same, as is hereinafter more fully set forth. I In the drawings, the end. frames A of the reel are connected by ribs, c, in the usual way.

B is the bolting-cloth covering the reel.

O is the box having'jalaterahopening, L l

The box, in practice, has also a trough or chamber for receiving the flour, which is not shown in the drawing, and which has no particular'relatiou to the present invention. y

The rapper D is arranged to operate upon'the exterior of the bolt, one end of it being hinged or otherwise suitably attached to the box'O, and in such rela tion to the bolt that the rapper will rest across and bear "upon each one of the said ribs successively,'as it "passes under it, when the bolt is in motion.

The rapper is actuated to bear upon the ribs by means of a curved spring, E, one end of which is held by a screw or bolt, 0, passing through a slot, d, in the spring and entering or passing through the side of the boxatthat point;

The free end of the spring bears upon the rapper,

; as shown. l l

Theobject of the slot is toenable the spring to be shortened or lengthened, and thereby increase or diminis h its pressure upon the rapper.

The rapper is formed with a jogor shoulder, b,

which may result from bending a metal bar to form the said shoulder, or by cuttingaway the material of the rapper, when the, latteris of wood or metal.

The ribs a are provided with external cleats orprojections, f, which are atfixed to them. in the line of their passage under the rapper, and are for thepurpose of lifting the rapper to procure the requisite blow or cduoussion, as the said cleats leave the, shoulder 11,

, This invention relates to the rappers, so called, of I the flour-bolts of grist-mills, and consists in the confor as the bolt revolves toward the rapper, the cleats successively encounter the under side of the rapper, near its front end, and raise it a certain distance during the passage .of the cleat to the shoulder 11, and as the cleats leave the said shoulder, the rapper is left free to spring back upon the-next cleat immediately following,

thus giving a blow or jar to the bolt, which shakes out 'the bran and coarse particles of flour, which were stuck in or adhered to .the bolting-cloth.

The length of the rapper, from its shoulder to its free end, is somewhat greater than the distance be tween the ribs, so that as one oleat has passed theshoulder, the next is brought under the free end of the rapper to receive its blow, and then passes forward to raise it for the next blow.

We will note that the spring may be of any suitable form, arrangement, orconstruction, and need not necessarilybeadjustable, as before described, although that feature of our invention is desirable, as it enables the blow of the rapper to be regulated to the different conditions of the flour, as damp flour will require a more forcible blow than dry flour.

The arrangement of the rapper on the side of the bolt, which is passing downward, "isanother improved feature in bolt-rappers, for by such arrangement that portion of the bolt willbe free from the main body or bulk of the flour, and the bran and coarser particles adherent to or enmeshed in the bolting-cloth will be shaken back into the'bolt, instead of being driven through to mingle with and deteriorate the quality of the bolted dour, as is the case with rappers heretofore employed.

The rapper D may consist simply of a strip or bar. of spring-metal, having its lower end affixed to the box so as to act as a spring itself, and dispense with the accessory spring E, and an adjustable projection may be provided to bear against the upper side of such rapper with different degrees of impact, or at different distances from the fixed end of the rapper, and thus. adjust theblow of the latter for the purpose aforesaid. I I,

The rappers may be multiplied, if desired.

We claim as new, and desire to secure by Letters Patent- The external rapper, (one or more,) havinga shoulder, b, and the spring E, in combination with cleats f, on

the ribs 0. of a flour-bolt, substantially as described.

WILLIAM H. ALLEN. WILLIAM STODDARD. Witnesses:

JACOB STORY, D. MORRILL.

NA, MIN 

